bug fix: allow folder names up to length 64 in leveldb

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When extracting a folder name from the byte slices used as database
keys, bytes.IndexByte() is used to find and remove trailing 0 bytes.
In case the folder name is 64 bytes long, bytes.IndexByte() returns
-1.  Before this change, syncthing crashed in this case with an
out-of-bounds slice access.

The commit fixes the problem and also introduces a test case which
checks for the presence of the bug.

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Gitea Version: 1.28.0+dev-477-g8b6ad49a5f